JP2012007471A - Underground irrigation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a water-stopping performance by allowing a float 26 smoothly moving in the vertical direction in response to a change in water-level, causing a valve body 40 to open/close a water inlet 22 at appropriate timing, and causing the valve body 40 to tightly close the water inlet 22.SOLUTION: A water-level management unit 10 includes a water supply pipe 14 and a float 26. The water supply pipe 14 is fixed in a vertical direction by a shaft fix member 24, and the float 26 moves up/down along the water supply pipe 14 correspondingly to a water level. The float 26 is connected to a valve body 40 with a link mechanism 38 intervening so that the valve body 40 opens/closes a water inlet 22 of the water supply pipe 14 in association with the up/down movement of the float 26.

Description

  The present invention relates to an underground irrigation system, and more particularly, to an underground irrigation system using, for example, a water level manager accommodated in a water tank.

An example of a conventional water level management device is disclosed in Patent Document 1. In the float valve of Patent Document 1, a water supply pipe is connected to a water storage tank, and a valve main body is attached to the tip of the water supply pipe, and a valve body in the valve main body and a float floating in the water storage tank are connected by an interlocking mechanism. Has been. By this interlocking mechanism, when the float moves up and down according to the fluctuation of the water level in the water storage tank, the valve element opens and closes the water supply pipe in conjunction with the up and down movement.
Japanese Patent No. 3026421 [F16K 31/24, E03B 11/00, F16H 21/10]

  In the prior art of Patent Document 1, if the float is only floating on the water surface, the float is affected by waves and water flow on the water surface, and the float is tilted, so that the vertical movement of the float according to the water level fluctuation is suppressed. Or a gap may be formed between the valve body and the valve seat, and the valve body may not be able to block the water supply pipe without a gap at an accurate timing, which causes a problem in water stoppage.

  Therefore, a main object of the present invention is to provide an underground irrigation system that prevents excess water from being supplied to cultivated land by using a water level controller capable of improving water-stopping.

  The invention of claim 1 is laid on a cultivated land, and is formed at a water supply pipe for supplying water to the cultivated land, at an upstream end of the water supply pipe, and the water level inside the water pipe is via the water supply pipe. In response to fluctuations in the water level in the vertical pipe section that is housed in the vertical pipe section that is linked to the groundwater level of the cultivated land. A water level controller that adjusts the water supply from the water supply port into the vertical pipe by opening and closing the water supply port, and the groundwater level of the cultivated land at the predetermined groundwater level. It is an underground irrigation system equipped with a water level setting device that discharges groundwater from the cultivated land to the drainage channel via the drainage pipe when the value is higher than the set value.

  Invention of Claim 2 is the underground irrigation system of Claim 1 which set the water level which a valve body opens and closes the said water supply port based on the said groundwater level setting value.

  In the invention of claim 3, when the groundwater level of the cultivated land is lower than the set value of the groundwater level, the valve body opens the water supply port and water is supplied from the water supply port into the vertical pipe portion, and the groundwater level of the cultivated land is set to the groundwater level. 3. The underground irrigation system according to claim 2, wherein when the value is higher than the value, the valve body closes the water supply port and water supply from the water supply port into the vertical pipe portion is stopped.

  According to a fourth aspect of the present invention, the water level management device includes a float that is guided by the water supply pipe and interlocks with the fluctuation of the water level in the vertical pipe portion, the valve body is connected to the float, and the water supply port is closed when the float rises. The underground irrigation system according to claim 3, wherein the water supply port is opened when the float descends.

  In the invention of claim 5, the water level setting device is arranged in the vertical direction, the outer pipe part connected to the drainage pipe on the downstream side surface, and arranged in the vertical direction in the outer pipe part, and both ends are open, The lower end opening includes the inner pipe part connected to the water supply pipe, the water level in the inner pipe part is linked to the groundwater level of the cultivated land through the water supply pipe, and the upper end opening sets the groundwater level at the height of the inner pipe part 5. The underground irrigation system according to claim 3 or 4, which is set to be located at a value.

  According to this invention, since the float is moved up and down using the water pipe as a guide, the water stoppage is excellent, so that it is possible to prevent excessive water from being supplied to the cultivated land.

  The above object, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

It is a fragmentary sectional view which shows the state which installed the water level management device of one Example of this invention in the water tank. It is a top view which shows the water level management device of FIG. It is a top view which shows the water level management device of FIG. It is a top view which shows the water level management device of FIG. It is sectional drawing which shows a valve body, an angle adjustment part, and a valve body link part. It is an illustration figure which shows the state which has arrange | positioned the water level management device, the water supply pipe, and the water level setting device in the cultivated land. It is sectional drawing which shows the cultivated land using an underground irrigation system when the groundwater level W of a cultivated land is lower than a water level setting value. It is sectional drawing which shows the cultivated land using an underground irrigation system in case the groundwater level W of a cultivated land is higher than the water level setting value S. It is sectional drawing which shows the water level management device of another Example of this invention. It is sectional drawing which shows the water level management device of another Example of this invention. It is sectional drawing which shows the water level management device of another Example of this invention. (A) is sectional drawing which shows the water level management device of another Example of this invention, (b) is sectional drawing which shows the water level management device of another Example of this invention. It is sectional drawing which shows the water level management device of another Example of this invention. It is sectional drawing which shows the water level management device of another Example of this invention. It is sectional drawing which shows the water level management device of another Example of this invention.

  A water level management device 10 according to an embodiment of the present invention shown in FIG. 1 is accommodated in a water tank 12 and adjusts the supply of water according to the water level in the water tank 12.

  The aquarium 12 is a water storage section such as an artificial aquarium, pits such as pipes and wells, and a reservoir.

As shown in FIGS. 1 to 4, the water level manager 10 includes a water pipe 14. The water supply pipe 14 is a pipe for supplying water, and includes a main body portion 16 and a tip portion 18. The main body portion 16 is a tube that connects a water supply main pipe (not shown) and the tip 18, and is formed by connecting a plurality of straight tubes or flexible tubes, or formed by a single flexible tube. Or The tip 18 is a straight pipe provided vertically, and is formed of a metal such as SUS or a synthetic resin such as vinyl chloride resin. The length of the distal end portion 18 is set as appropriate, but is set shorter than the main body portion 16 in terms of conveyance, installation, economy, and the like. One end portion of the distal end portion 18 is a connection portion for connecting to the main body portion 16, and a bamboo shoot-like cut or the like is provided on the surface thereof so that the main body portion 16 is difficult to come off. The other end of the distal end portion 18 is used as a valve seat 20 that receives the valve element, and the other end opening is used as a water supply port 22 that supplies water into the water tank 12. Further, for example, two shaft fixtures 24 and a float 26 are arranged around the tip portion 18.

  The shaft fixing tool 24 is attached to the water supply pipe 14 and has an end portion that prevents the water supply pipe 14, particularly the tip end portion 18 from tilting along the inner surface of the water tank 12, and is formed of, for example, a flat plate. The shaft fixture 24 is made of a synthetic resin such as polyvinyl chloride and includes an insertion hole 28. The insertion hole 28 is a hole through which the water supply pipe 14 is inserted, and is disposed at the center or substantially the center of the shaft fixture 24. Then, the shaft fixing tool 24 is fixed to the water supply pipe 14 passed through the insertion hole 28 with a screw or the like. Further, the end of the shaft fixing tool 24 is formed in an arc shape or the like so that the end of the shaft fixing tool 24 is along the inner surface of the water tank 12, and the length of the shaft fixing tool 24 is set slightly smaller than the inner diameter of the water tank 12. Further, the two shaft fixtures 24 are respectively attached to the upper part and the lower part of the water pipe 14, and these are arranged so as to intersect at right angles to each other. The upper shaft fixture 24 includes a length adjusting unit 30 and an opening 32. The length adjusting unit 30 finely adjusts the length of the shaft fixing tool 24, and a bolt or the like is used. The length adjusting unit 30 is attached from the opening 32 toward the side surface of the upper shaft fixing tool 24, and by rotating the length adjusting unit 30, the length protruding from the side surface of the shaft fixing tool 24 is changed. The length of the shaft fixture 24 is adjusted.

  The float 26 is disposed above the water supply port 22, floats on the water surface in the water tank 12, and moves up and down in accordance with the water level fluctuation in the water tank 12, and uses a synthetic resin such as vinyl chloride, polypropylene, or polyethylene. And formed by hollow molding or the like. This synthetic resin is appropriately selected. The float 26 has, for example, a ring shape and includes a through hole 34 at the center thereof. In order to prevent the float 26 from contacting the inner surface of the water tank 12, the diameter of the float 26 is set smaller than the inner diameter of the water tank 12. The height of the float 26 is set according to the required buoyancy of the float 26, that is, the force with which the valve body closes the water supply port 22.

  The through hole 34 is a portion through which the water supply pipe 14, particularly the tip 18, passes through the float 26 in the axial direction. The diameter of the through hole 34 is set to be slightly larger than the outer diameter of the water supply pipe 14 so that the float 26 can move along the water supply pipe 14.

  The float 26 further includes two float link portions 36. The float link portion 36 is formed of a plate-like body made of a synthetic resin such as vinyl chloride, polypropylene, or polyethylene. The two float link portions 36 are joined to the lower surface of the float 26 by welding or the like with a through hole 34 interposed therebetween. A link mechanism 38 is joined to the float link portion 36, and the float 26 is connected to the valve body 40 via the link mechanism 38.

As shown in FIGS. 1 to 5, the valve body 40 is disposed below the water supply port 22, contacts the valve seat 20 and closes the water supply port 22, and when the float 26 rises, the water supply port 22. When the float 26 is closed and the float 26 descends, the water supply port 22 is opened to adjust the amount of water supplied from the water supply port 22. The valve body 40 includes a contact part 42, a seat part 44, an angle adjustment part 50, and a valve body link part 46. The contact part 42 is disk-shaped and includes a contact surface 48 on the surface thereof. The contact portion 42 is formed of an elastic material such as ethylene propylene rubber or a synthetic resin so that the contact surface 48 contacts the valve seat 20 without any gap. The contact surface 48 is a flat surface that contacts the valve seat 20 and closes the water supply port 22, faces the water supply port 22, and is disposed in parallel to the valve seat 20. The seat portion 44 is a portion that supports the contact portion 42 and is formed in a disk shape using a synthetic resin such as vinyl chloride resin or a metal such as SUS. Arranged in layers. The diameters of the abutting portion 42 and the seat portion 44 have a size corresponding to the valve seat 20, and are set larger than the diameter of the valve seat 20, that is, the outer diameter of the tip of the water supply pipe 14. Further, the valve body 40 is connected to the valve body link part 46 via the angle adjusting part 50.

  The angle adjuster 50 is disposed between the seat 44 and the valve body link 46 so as to support the contact 42 and the seat 44 and adjust the angle of the contact surface 48 by elastic deformation or the like. The abutting portion 42 and the seat portion 44 are fixed to the valve body link portion 46 with bolts or the like. The angle adjusting unit 50 is formed in a disk shape or a cylindrical shape using an elastic material such as ethylene propylene rubber or a synthetic resin. The diameter of the angle adjustment unit 50 is set smaller than the diameters of the contact part 42 and the seat part 44 because the contact part 42 and the seat part 44 are inclined. If the hardness of the angle adjusting part 50 is too small, the force that the angle adjusting part 50 supports the contact part 42 and the seat part 44 becomes weak, and the contact surface 48 cannot contact the valve seat 20 without a gap. On the other hand, if the angle is too large, the angle adjusting unit 50 is difficult to deform, and the angle of the contact surface 48 cannot be adjusted appropriately due to elastic deformation. Is done.

  The valve body link portion 46 is connected to the link mechanism 38 while supporting the contact portion 42, the seat portion 44, and the angle adjusting portion 50, and is U-shaped using a metal such as SUS or a synthetic resin. It is formed in a shape. Both ends of the valve body link part 46 are connected to the link mechanism 38, and the contact part 42, the seat part 44 and the angle adjustment part 50 are attached to the center of the valve body link part 46.

  The link mechanism 38 transmits the movement of the float 26 to the valve body 40, and links the vertical movement of the float 26 and the movement of the valve body 40 to open and close the water supply port 22. 56 and third section 58. The link mechanism 38 includes two first arms 60, two second arms 62, and two third arms 64. The first arm 60, the second arm 62, and the third arm 64 are each formed of a flat bar or the like using a metal such as SUS or a synthetic resin. A first node 54 is provided on the first arm 60, a second node 56 is provided on the second arm 62, and a third node 58 is provided on the third arm 64. The length between the first node 54 and the second node 56 is set longer than the length between the second node 56 and the third node 58. Also, the two first arms 60 are pin-joined at the respective upper ends, the lower ends of the first arms 60 are pin-joined with the upper ends of the second arms 62, and the two second arms 62 cross each other. The lower ends of the second arms 62 are pin-joined with the upper ends of the third arms 64, and the lower ends of the two third arms 64 are pin-joined. Accordingly, two rhombus portions 66 and 68 are provided, and the upper rhombus portion 66 is formed larger than the lower rhombus portion 68. In addition, since the respective joints are pin-joined, the arms 54, 56, and 58 are joined in a rotatable manner, so that the rhombus portions 66 and 68 can be deformed as shown in FIGS. Furthermore, the length of the diagonal line of each rhombus 66, 68 expands and contracts.

  The first node 54 is a connection node with the float 26 to which the float 26 is pin-joined via the float link portion 36. The second node 56 is a connection node with the valve body 40 to which the contact portion 42 and the like are pin-joined via the valve body link portion 46. The third joint 58 is a connection joint with the water supply pipe 14 to which the water supply pipe 14 is pin-jointed together with the shaft fixture 24.

Thus, the two link mechanisms 38 are disposed with the water pipe 14 and the valve body 40 interposed therebetween, and are connected to the float 26, the water pipe 14 and the valve body 40. Then, as shown in FIG. 4, when the float 26 is lowered along the water supply pipe 14, the valve body 40 is lowered accordingly, and the valve body 40 opens the water supply port 22. On the other hand, as shown in FIG. 2, when the float 26 rises along the water supply pipe 14, the valve body 40 rises accordingly, and the valve body 40 closes the water supply port 22.

  In such a link mechanism 38, as shown in FIGS. 2 and 4, the ratio of the movement distance (F-F0) of the float 26 and the movement distance V of the valve body 40 is the upper rhombus portion of the link mechanism 38. 66 is proportional to the ratio of the diagonal line (U-U0) to the diagonal line D of the lower rhombus portion 68. For this reason, the moving distance of the valve body 40 can be changed by adjusting the length of the diagonal line, and if the value of U / D is increased, the force with which the valve body 40 is pressed against the valve seat 20 increases. The water supply port 22 is closed to the valve body 40 with a strong force.

  As shown in FIGS. 1 and 3, the water level manager 10 includes a finger pinching prevention cover 70, and the finger pinching prevention cover 70 is attached to the front surface of the link mechanism 38. The finger pinching prevention cover 70 is a cover that prevents a finger from being pinched by the link mechanism 38 when the finger enters the rhombus portions 66 and 68 and the link mechanism 38 expands and contracts. The finger pinching prevention cover 70 is formed of ethylene propylene rubber or the like, and its size is set to a size that covers the link mechanism 38, particularly the rhombus portions 66 and 68.

  When using such a water level management device 10, first, the main body portion 16 is connected to the distal end portion 18, the water level management device 10 is placed in the water tank 12, and the valve body 40 is in contact with the valve seat 20, that is, a float. The height of the water level controller 10 is adjusted so that the float 26 is positioned at a predetermined water level set value in a state where the 26 is raised. Then, the length adjusting unit 30 is adjusted to make the upper shaft fixture 24 longer, and the upper shaft fixture 24 is stretched against the inner surface of the water tank 12, thereby fixing the water supply pipe 14 to the water tank 12. If the tip 18 is arranged in the vertical direction, the installation of the water level management device 10 is finished. When the water is supplied to the water supply pipe 14, the water is supplied into the water tank 12 from the water supply port 22. The float 26 floats on this water, and the float 26 moves up and down using the water supply pipe 14 as a guide in conjunction with the fluctuation of the water level.

  When the float 26 rises, the valve body 40 closes the water supply port 22 and stops water supply. On the other hand, when the float 26 descends, the valve body 40 opens the water supply port 22 to supply water.

  In this way, when the float 26 uses the water pipe 14 as a guide, the float 26 is affected by the waves on the water surface, the water flow, and the like, so that the float 26 is unlikely to tilt or contact the inner surface of the water tank 12, and the water level changes. Therefore, the valve body 40 can open and close the water supply port 22 at an appropriate timing, and is excellent in water stoppage.

  Moreover, since the water supply pipe 14 is not easily tilted by the shaft fixing tool 24, the float 26 using the water supply pipe 14 as a guide and the valve body 40 interlocking with the float 26 are also difficult to tilt, and the valve body 40 closes the water supply port 22 without a gap. Further, the water stoppage is improved.

  In particular, when the float 26 moves up and down along the water supply pipe 14 and the valve body 40 is connected to the float 26, the relative positions of the water supply port 22 and the valve seat 20 and the valve body 40 do not change, and the valve seat Since the valve body 40 does not tilt with respect to the valve body 20, the valve body 40 contacts the valve seat 20 without a gap, so that the water supply port 22 is reliably closed and water-stopping is further improved.

  Further, if the first node 54 connected to the float 26 is used as a power point, the second node 56 connected to the valve body 40 is used as an action point, and the third node 58 connected to the water supply pipe 14 is used as a fulcrum, the lever principle is used. Since the vertical movement of the float 26 acts on the valve body 40, and the force that the float 26 ascends can be transmitted to the valve body 40, the valve body 40 is directed upward with a strong force and can block the water supply port 22 without any gap. it can.

Further, even if the contact surface 48 is inclined with respect to the valve seat 20, if the angle of the contact surface 48 is adjusted by the angle adjusting unit 50, the contact surface 48 is in contact with the valve seat 20. The angle of the contact surface 48 is adjusted so that the contact surface 48 is parallel to the valve seat 20, so that the contact surface 48 hits the valve seat 20 without any gap and completely closes the water supply port 22. it can.

  Further, the water level management device 10 can be installed without a person entering the water tank, and the water level management device 10 can be installed as long as the cross-sectional area of the water tank can be inserted.

  FIGS. 6-8 is an Example at the time of using this water level management device 10 for the underground irrigation system 74 which supplies irrigation water from a water pipe to a cultivated land. In this underground irrigation system 74, a water supply channel 76 is laid on one side of the cultivated land 72, and a drainage channel 78 is laid on the other side.

  The water supply path 76 is a pipe for supplying water to the cultivated land 72 and is connected to the water supply pipe 14. A portion where the water supply pipe 86 is raised, that is, a vertical pipe portion 85 is provided as a water tank near the water supply path 76, and the water level manager 10 is disposed in the vertical pipe portion 85. On the other hand, the drainage channel 78 is a channel for discharging excess ground water from the cultivated land 72, and a drainage pipe 80 and a drainage groove 82 are used. The drainage path 78 is connected to the water level setting device 84 via the drainage pipe 80. Connected. A plurality of water supply pipes 86 are connected between the vertical pipe portion 85 and the water level setting device 84, and each water supply pipe 86 is laid on the cultivated land 72. Thereby, the water level of the vertical pipe part 85 and the water level of the water level setter 84 are linked to the groundwater level W of the cultivated land 72 via the water supply pipe 86.

  The water level setter 84 sets the groundwater level W of the cultivated land 72 and includes an outer pipe portion 88 and an inner pipe portion 90. The outer tube portion 88 is arranged in the vertical direction, has a bottom at its lower end, opens at its upper end, and is fitted with a lid 92 at its upper end opening so that it can be opened and closed. The upper end opening is used as an inspection port of the underground irrigation system 74 by opening the lid 92. A drain pipe 80 is connected to the downstream side surface of the outer pipe section 88, and the inner pipe section 90 is disposed in the outer pipe section 88.

  The inner pipe part 90 is arranged in the vertical direction, both ends are open, and the lower end opening is connected to the water supply pipe 86 via a joint or the like. The height of the inner pipe portion 90 is set so that the upper end thereof is positioned at the groundwater level set value S of the cultivated land 72.

  As shown in FIG. 7, when the groundwater level W of the cultivated land 72 is lower than the groundwater level set value S, the water level of the vertical pipe portion 85 becomes the same height as the groundwater level W, and the float 26 is from the groundwater level set value S. As a result, the link mechanism 38 is contracted and the valve body 40 is lowered, and the water supply port 22 is opened. Water is supplied from the water supply port 22 to the vertical pipe portion 85, and the water is supplied to the cultivated land 72 from the many pores of the water supply pipe 86 through the water supply pipe 86.

  On the other hand, as shown in FIG. 8, when the groundwater level W of the cultivated land 72 is equal to or higher than the groundwater level set value S, the water level of the vertical pipe 85 is linked to the groundwater level W and the groundwater level set value S It becomes the same or higher, and accordingly, the float 26 is also equal to or higher than the groundwater level set value S. When the float 26 rises, the link mechanism 38 extends to raise the valve body 40, the valve body 40 hits the valve seat 20, closes the water supply port 22, and the supply of water is stopped.

  Further, when the groundwater level W of the cultivated land 72 is higher than the groundwater level set value S, the groundwater of the cultivated land 72 flows into the water supply pipe 86, flows through the water supply pipe 86 to the inner pipe portion 90, and It overflows from the upper end opening to the outer pipe portion 88 and is discharged from the outer pipe portion 88 to the drainage channel 78 through the drainage pipe 80.

  As described above, the valve body 40 can open and close the water supply port 22 at an accurate timing without any gap, thereby preventing supply of excessive water to the cultivated land 72.

The link mechanism is not limited to the shape shown in FIG. 1, and for example, a link mechanism 94 shown in FIG. 9 can be used. The link mechanism 94 is substantially the same as the link mechanism 38 in FIG. 1, but the shape of the link mechanism 38 is different, and one first arm 60, one second arm 62, and one third arm 64. including. Also in this case, the same operation and effect as the link mechanism 38 of FIG. 1 are shown.

  As another link mechanism, a link mechanism 96 shown in FIG. 10 can also be used. The link mechanism 96 includes four fourth arms 98 and two fifth arms 100. The four fourth arms 98 are combined in a rhombus shape by pin-joining each end, and two of the four fourth arms 98 and two of the fifth arms 100 are rhombus-shaped. Thus, the upper end portion of the fifth arm 100 is pin-joined to the upper end portion of the fifth arm 100, and the lower end portion is pin-joined to the fourth arm 98.

  The link mechanism 38 includes a first joint 102, a second joint 104, and a third joint 106, and the first joint 102 is provided at the joint portion of the upper end portion of the fourth arm 98, via the float link portion 36. Pinned to the float 26. The second node 104 is provided at the joint at the upper end of the fifth arm 100 and is pin-joined to the seat body 40. The third node 106 is provided at the joint at the lower end of the fourth arm 98 and is pin-joined to the water supply pipe 14 together with the shaft fixing tool 24. Also in this case, the same operation and effect as the link mechanism 38 of FIG. 1 are shown.

  In all the embodiments described above, an elastic material is used for the angle adjusting unit 50, but the present invention is not limited to this as long as the angle of the contact surface 48 can be adjusted while supporting the seat 44. For example, the spring 108 shown in FIG. 11 and the curved body 110 shown in FIG.

  In the case of the angle adjusting unit 50 shown in FIG. 12A, the curved body 110 includes a sphere and an ellipsoid, and is formed of a highly rigid material such as a metal or a synthetic resin. It is fixed to the link part 46. The receiving portion 112 can be formed on the seat portion 44. The receiving part 112 is a hollow formed with a curved surface, and the curvature of the curved surface is set smaller than the curvature of the curved body 110. Since the seat portion 44 is inclined along the curved surface body 110 of the receiving portion 112, the curved surface body 110 can adjust the angle of the contact surface 48 while supporting the contact portion 42 and the seat portion 44.

  And as another curved surface body 113a, the curved surface body 113a shown in FIG.12 (b) can also be used. The curved body 113a is the head of the bolt 113b and is covered with a seat portion 115a and a retaining portion 115b. The seat portion 115a has a curved surface along the curved surface of the curved surface body 113a and a space for accommodating the curved surface body 113a therein, and has a contact portion 42 on the surface thereof. The leg portion of the bolt 113b is fixed to the valve body link portion 46 with a nut 113c, and is disposed between the seat portion 115a and the valve body link portion 46. Thereby, the bolt 113b supports the contact portion 42 and the seat portion 115a, and adjusts the angle of the contact surface 48 by the curved body 113a, thereby functioning as an angle adjusting portion.

  Furthermore, in all the embodiments described above, the end of the tip 18 is used as the valve seat 20, but the base 114 can be attached to the tip 18. The base 114 is formed in a cylindrical shape using metal, synthetic resin, or the like, and is attached to the end of the water supply pipe 14 by screw joining or welding. In this case, the end of the base 114 receives the valve body 40 as the valve seat 20, and the end opening of the base 114 serves as the water supply port 22.

  A water level controller 10 according to another embodiment of the present invention shown in FIG. 14 is substantially the same as the water level controller 10 shown in FIG. 1, but a valve body 116 is attached to the end of the water supply pipe 14. Since the other parts are the same as those of the water level management device 10 shown in FIG. 1 embodiment, the common parts are denoted by the same reference numerals and the description thereof is omitted.

  The valve body 116 is made of metal, synthetic resin, or the like, and has an upper surface, a lower surface, and a cylindrical side surface. A water pipe attachment port 118 and a through hole 120 are provided on the upper surface, and a valve seat 122 including the water supply port 22 is provided on the lower surface. The water pipe attachment port 118 is a connection part connected to the tip of the water pipe 14 by screw joining or welding, and the through hole 120 is a hole through which the valve body link part 46 is passed. The valve seat 122 faces upward. One end of the valve body link portion 46 is pin-joined to the link mechanism 38, passes through the through hole 120, and the other end is inserted into the valve body 116. The contact surface 48 of the valve body 40 is accommodated in the valve body 116 and is disposed to face the water supply port 22. Further, the lid portion 124 is attached to the valve body link portion 46. The lid portion 124 closes the through hole 120 when the valve body 40 is lowered, and is formed of an elastic material or the like, and is disposed outside the valve body 40. Thereby, even if the valve body 40 is lowered and water is supplied from the water supply port 22 and the inside of the valve main body 116 is filled with the water, the lid portion 124 blocks the through hole 120, so that the water does not leak from the through hole 120.

  Further, in this link mechanism 38, the float 26 is pin-joined to the first joint 54 via the float link part 36, and the contact part 42 and the like are pin-joined to the third joint 58 via the valve body link part 46, The water supply pipe 14 is pin-connected to the second node 56 via the shaft fixing tool 24.

  According to this, the water supplied by the water supply pipe 14 is supplied from the water supply port 22 to the vertical pipe portion 85. Then, when the level of the supplied water is raised, the float 26 rises accordingly, and the valve body 40 is lowered accordingly and comes into contact with the valve seat 122 to close the water supply port 22. Accordingly, the water flows toward the valve seat 122, whereas the valve body 40 moves from the water supply pipe 14 toward the valve seat 122. Therefore, the direction of the water pressure of the water and the valve seat 122 of the valve body 40 are changed. The direction in which the valve body 40 is closed coincides, and the force by which the valve body 40 presses the valve seat 122 is increased by the water pressure. And excellent water-stopping properties.

  Moreover, a water supply place can be set arbitrarily by connecting piping to the water supply port 22 and laying down to an arbitrary place.

  Furthermore, the specific numerical values of the angles and dimensions mentioned above are merely examples, and can be appropriately changed as necessary.

  In all of the above embodiments, the link mechanisms 38, 94, and 96 are used as the linkage between the vertical movement of the float 26 and the movement of the contact surface 48 opening and closing the water supply port 22. However, the present invention is not limited to this. . For example, the arm part 126 shown in FIG. 15 can also be used. The arm portion 126 is formed in a U shape using, for example, a metal such as SUS or a synthetic resin. Both ends of the arm portion 126 are connected to the float link portion 36, and the center of the arm portion 126 is connected to the contact portion 42, the seat portion 44, and the angle adjusting portion 50. Thereby, as the float 26 rises, the arm portion 126 pulls up the contact portion 42 and the like, so that the contact surface 48 closes the water supply port 22. On the other hand, when the float 26 is lowered, the arm portion 126 pulls down the contact portion 42 and the contact surface 48 opens the water supply port 22.

  Furthermore, in all the embodiments described above, the valve body 40 is formed by the abutting portion 42, the seat portion 44, the angle adjusting portion 50, and the valve body link portion 46, but any of these may be omitted.

  Further, in all the embodiments described above, the finger pinching prevention cover 70 is used, but this may not be used.

Further, in FIGS. 2, 4, and 7 to 10, the finger pinching prevention cover 70 is not shown for convenience so that the link mechanism 38 and the like can be easily understood.

DESCRIPTION OF SYMBOLS 10 ... Water level management device 12 ... Water tank 14 ... Water supply pipe 20, 122 ... Valve seat 22 ... Water supply port 24 ... Shaft fixture 26 ... Float 38, 94, 96 ... Link mechanism 40 ... Valve body 48 ... Contact surface 50 ... Angle adjusting section 54, 102 ... First section 56, 104 ... Second section 58, 106 ... Third section 70 ... Finger pinching prevention cover 72 ... Cultivated land 74 ... Underground irrigation system 86 ... Water supply pipe 108 ... Spring 110, 113a ... curved body 113b ... bolt 116 ... valve body 118 ... water pipe attachment port

Claims (5)

A water supply pipe laid on the cultivated land and supplying water to the cultivated land;
A vertical pipe portion formed at the upstream end of the water supply pipe, the water level of which is linked to the groundwater level of the cultivated land via the water supply pipe,
A water supply pipe having a water supply port for supplying water from the water supply channel into the vertical pipe section;
The water supply port is opened and closed with a valve body in accordance with the fluctuation of the water level in the vertical pipe portion that is accommodated in the vertical pipe portion and interlocked with the groundwater level of the cultivated land, and water is supplied from the water supply port into the vertical pipe portion. A water level controller to be adjusted; and provided at the downstream end of the water supply pipe, when the groundwater level of the cultivated land is higher than a predetermined groundwater level set value, the groundwater of the cultivated land is drained through a drain pipe. Underground irrigation system with a water level setter that discharges to the road.   The underground irrigation system according to claim 1, wherein a water level at which the valve body opens and closes the water supply port is set based on the groundwater level setting value.   When the groundwater level of the cultivated land is lower than the set value of the groundwater level, the valve body opens the water supply port and water is supplied from the water supply port into the vertical pipe portion, and the groundwater level of the cultivated land is set to the groundwater level. The underground irrigation system according to claim 2, wherein when the value is higher than the value, the valve body closes the water supply port and water supply from the water supply port into the vertical pipe portion is stopped. The water level manager includes a float that is guided by the water pipe and interlocks with fluctuations in the water level in the vertical pipe section,
The underground irrigation system according to claim 3, wherein the valve body is connected to the float and closes the water supply port when the float rises, and opens the water supply port when the float descends. The water level setter is
An outer pipe portion that is arranged in the vertical direction and is connected to the downstream side surface of the drain pipe, and an inner pipe portion that is arranged in the vertical direction in the outer pipe portion and that is open at both ends and whose lower end opening is connected to the water supply pipe. Including the pipe section,
The water level in the inner pipe part is linked to the groundwater level of the cultivated land via the water supply pipe, and the height of the inner pipe part is set so that the upper end opening is located at the groundwater level set value. The underground irrigation system according to claim 3 or 4.

Images